def city_country(city_name, city_belong_to):
    city_message = city_name + ', ' + city_belong_to
    return city_message


message_1 = city_country('Beijing', 'China')
message_2 = city_country('London', 'Britain')
message_3 = city_country('Tokyo', 'Japan')
print(message_1)
print(message_2)
print(message_3)
